Apparatus for scanning an optically readable record carrier

Details Apparatus for scanning an optically readable record carrier Apparatus for scanning an optically readable record carrier

1996-12-13

1998-11-24

Edun, Muhammad N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369112, G11B 709

Patent

active

058417460

ABSTRACT:
A device for optically scanning an information layer by means of a focused radiation beam. Radiation reflected from the information layer is made astigmatic by an oblique plane parallel plate and subsequently detected by a detection system. An electronic circuit 26 derives two focus error signals, each representing the distance between the focal point of the radiation beam and the information plane. The first focus error signal is formed from the high-frequency components in the electrical detector signals, and the second focus error signal is formed from the low-frequency components in the same detector signals. A second electronic circuit combines the two focus error signals to a combined focus error signal.

REFERENCES:
patent: 5436876 (1995-07-01), Yokoyama et al.
patent: 5602383 (1997-02-01), Takekoshi et al.
patent: 5610883 (1997-03-01), Yanagawa
patent: 5633846 (1997-05-01), Okuyama et al.

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